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# Honors Chem Ch. 2

Term | Definition |
---|---|

FORMULA FOR DENSITY | Mass / volume (y2-y1 / x2-x1) |

PERCENT ERROR EQUATION | Actual - experimental / actual X 100 |

SIGNIFICANT DIGITS: multiplication and division | The # of significant digits in the end total is the same as the measurement with the smallest # of sig. digits |

SIGNIFICANT DIGITS: addition and subtraction | If all #s have decimals, then the limiting term is the one with the smallest # of decimal places |

SCIENTIFIC NOTATION: multiplication | Multiply coefficients, then add exponents |

SCIENTIFIC NOTATION: division | Divide coefficients, then subtract exponents |

ACCURACY | How close values are to an accepted value |

PRECISION | How close values are to one another |

CALCULATING CELCIUS | C= K-273 |

CALCULATING KELVIN | K= C+273 |

DERIVED UNITS | A combination of units (MPH, meters per sec) |

DERIVED UNITS FOR DENSITY | g/cm cubed |

A penny has a mass of 3.1g and a volume of .35mL. What is the density? | 3.1/0.35= 8.9 g/mL(3) |

DIMENSIONAL ANALYSIS | Systematic way of converting units using conversion factors |

CONVERSION FACTORS | Ratios of equivalent values (1hr/60min)(1y/365days) |

ERROR | The difference between experimental and accepted values |

YOU MUST HAVE THE SAME EXPONENT WHEN ___ OR ___ IN SCIENTIFIC NOTATION | Adding or subtracting |

ADDITION | Add coefficients. Exponents must be the same. |

SUBTRACTION | Subtract coefficients. Exponents must be the same. |

MULTIPLICATION | Multiply coefficients; add exponents. |

DIVISION | Divide coefficients; subtract exponents. |

All non-___ numbers are significant. | Zero |

Sandwiched zeros (zeros in ____ sig. digits)are significant. | Between |

Zeros that are only _____ for a decimal are insignificant. | Placeholders |

Zeros at the ___ of a number that also contains a ____ are significant. | End; decimal |

Exact numbers have an ____ number of significant digits. | Infinite |

1 liter = ______ | 1 cubic decimeter (dm3) |

EXPONENTS __ ___ HAVE TO BE THE SAME WHEN MULTIPLYING OR DIVIDING | Do not |

WHEN THE DECIMAL MOVES TO THE LEFT, THE EXPONENT: | Goes up |

WHEN THE DECIMAL MOVES TO THE RIGHT, THE EXPONENT: | Goes down |

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mma129